There are many types of food packaging materials covering plastic, glass, metal, carton and other types. Plastics alone include polyethylene (PE), low density polyethylene (LDPE), high density polyethylene (HDPE), polypropylene (PP), biaxially oriented polypropylene (OPP), polystyrene (PS), polyvinyl chloride (PVC), polyvinylidene Chloride (PVDC), polyester (PET), nylon (NY) or a composite film composed of several of the above exemplified.